Jackson, 31, started 35 games over the last three seasons along the Atlanta Falcons’ defensive line, where San Francisco’s new coach Kyle Shanahan was recently an offensive coordinator.

The Falcons ran a similar 4-3 scheme the 49ers are employing under first-time coordinator Robert Saleh, although defensive line doesn’t appear as an immediate need.

San Francisco spent first-round picks on defensive linemen in the last three NFL drafts, including April when it tapped Stanford’s Solomon Thomas with the third-overall selection.

The 49ers have more pressing needs along the interior of the offensive line and the secondary. However, 2016 seventh-overall pick DeForest Buckner has missed time over the last two weeks with an ankle sprain.

Jackson (6-4, 295) has nine sacks and 165 tackles over his eight seasons. He hasn’t registered a sack since 2013. And although he lasted five years with the Chiefs, the team that drafted him, the LSU alum has never appeared in Pro Bowl or been named an All Pro.

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